Code Inspection: Parameter type can be IEnumerable of T

If you have a method whose parameter is an array, a List, or some other type that implements IEnumerable<T>, JetBrains Rider offers an option to change the parameter type to IEnumerable<T> — provided that the method itself only iterates the collection and does not access any non-IEnumerable members.

The benefit from this change is that the method becomes agnostic with respect to the type of the collection you pass to it.

            
private void ViewCategories(IList<string> categories)
{
    foreach (var c in categories)
    {
        Console.WriteLine(c);
    }
}


        

            
private void ViewCategories(IEnumerable<string> categories)
{
    foreach (var c in categories)
    {
        Console.WriteLine(c);
    }
}


        

Last modified: 07 April 2022